Update module github.com/gorilla/websocket to v1.5.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
github.com/gorilla/websocket	require	minor	v1.4.2 -> v1.5.0

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Release Notes

gorilla/websocket

### [`v1.5.0`](https://togithub.com/gorilla/websocket/releases/v1.5.0) [Compare Source](https://togithub.com/gorilla/websocket/compare/v1.4.2...v1.5.0) Minor new features and maintenance update #### CHANGELOG - Dialer: add optional method NetDialTLSContext ([#​746](https://togithub.com/gorilla/websocket/issues/746)) [@​lluiscampos](https://togithub.com/lluiscampos) - Update README ([#​757](https://togithub.com/gorilla/websocket/issues/757)) [@​garyburd](https://togithub.com/garyburd) - Remove support for Go 1.8 ([#​755](https://togithub.com/gorilla/websocket/issues/755)) [@​garyburd](https://togithub.com/garyburd) - Improve protocol error messages ([#​754](https://togithub.com/gorilla/websocket/issues/754)) [@​garyburd](https://togithub.com/garyburd) - Update autobahn example ([#​753](https://togithub.com/gorilla/websocket/issues/753)) [@​garyburd](https://togithub.com/garyburd) - Fix broadcast benchmarks ([#​542](https://togithub.com/gorilla/websocket/issues/542)) [@​FZambia](https://togithub.com/FZambia) - Use context.Context in TLS handshake ([#​751](https://togithub.com/gorilla/websocket/issues/751)) [@​garyburd](https://togithub.com/garyburd) - Modify http Method String Literal to Variable ([#​728](https://togithub.com/gorilla/websocket/issues/728)) [@​thak1411](https://togithub.com/thak1411) - Update to match gofmt 1.17 ([#​750](https://togithub.com/gorilla/websocket/issues/750)) [@​garyburd](https://togithub.com/garyburd) - Document the allowed concurrency on Upgrader and Dialer ([#​636](https://togithub.com/gorilla/websocket/issues/636)) [@​ghost](https://togithub.com/ghost) - improve echo example ([#​671](https://togithub.com/gorilla/websocket/issues/671)) [@​hellflame](https://togithub.com/hellflame) - build: use build matrix; drop Go <= 1.10 ([#​629](https://togithub.com/gorilla/websocket/issues/629)) [@​elithrar](https://togithub.com/elithrar) - Fix Docs w.r.t. setting subprotocols ([#​627](https://togithub.com/gorilla/websocket/issues/627)) [@​elithrar](https://togithub.com/elithrar) - Fix how the client checks for presence of Upgrade: websocket, Connection: upgrade ([#​604](https://togithub.com/gorilla/websocket/issues/604)) [@​bluetech](https://togithub.com/bluetech)

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